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Data Communication

   

Added on  2023-01-17

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Running head: DATA COMMUNICATION 1
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DATA COMMUNICATION 2
Question 1
a. CIDR which is the short form of Classless Inter-Domain routing is always a
representation of the network bits of the IP address, the number which is always
preceded by the / is the CIDR number. This notation is majorly used due it its
conciseness.
i. /21=255.255.248.0 which if represented if the binary notation is
11111111.11111111.11111000.00000000 since it contains 21 on bits
hence /21
ii. /13=255.248.0.0 since it has 14 on bits in its binary formation.
iii. /29=255.255.255.248 since it has 29 on bits in its binary formation
b.
i. /19
𝐻 = 2𝑛 − 2
Where H=Number of hosts, n=Number of host bits. Since this is /19 the network
bits are 19, leaving 13 bits for the Hosts. But of the host's bits, 2 are subtracted,
that is subnet address and the broadcast address since they cannot be assigned to
host, therefore,
𝐻 = 213 − 2
𝐻 = 8192 − 2
𝐻 = 8190
ii. /30
𝐻 = 22 − 2
𝐻 = 4 − 2

DATA COMMUNICATION 3
𝐻 = 2
iii. /23
𝐻 = 29 − 2
𝐻 = 512 − 2
𝐻 = 510
c. To check for subnet mask legality, we consider legal subnets to be those that
contain all their 1’s in some consecutive order or all their 0’s are in consecutive
order. Anything else is not a legal subnet.
i. 255.255.224.0, when converted to binary notation, is
11111111.11111111.11100000.00000000. This meets the legality check
and its slash notation is /19
ii. 255.128.0.0, when converted to the binary notation, is
11111111.10000000.00000000.00000000. Again, meets the legality
check and its slash notation is /9
iii. 255.252.255.0, when converted to binary notation, is
11111111.11111100.11111111.00000000. This one violates the legality
check criteria hence not a legal subnet since 1’s appear after we have
bot some 0’s
iv. 255.255.255.254, when converted to binary notation, is
11111111.11111111.11111111.11111110. This meets the legality check
since all the 1’s are clearly consecutive. The slash equivalent of this is
/31

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